An inner buckle type clamping tool for injection mold

Abstract

The application relates to the technical field of injection mold, in particular to an inner buckle type clamping tool for an injection mold, which comprises a lower mold base and an upper mold base; a driving cavity is formed in the lower mold base; an electric push rod is fixedly installed in the driving cavity; a plurality of transmission rods are arranged in the driving cavity, and the transmission rods are connected with the electric push rod; a lateral groove is formed in the lower mold base and communicates with the driving cavity; an inner buckle clamping block is movably arranged in the lateral groove; a guide column is fixedly installed on the inner buckle clamping block; an oblique guide groove is formed in the transmission rod and is arranged obliquely; and the guide column is movably arranged in the oblique guide groove. The clamping tool for the mold occupies less horizontal space on the mold of the injection molding machine, the synchronism of the movement of each inner buckle clamping block of the clamping tool is improved, and the positioning and clamping effect of the clamp on the mold is improved.

Description

Technical Field

[0001] This invention relates to the field of injection mold technology, specifically to an internal clamping fixture for injection molds. Background Technology

[0002] For existing injection molding machines, the injection molds used typically need to be fixed by a clamping mechanism before they can operate. For example, the technical document with publication number CN222904701U, entitled "A Mold Clamping Fixture for an Injection Molding Machine," illustrates a form of existing injection mold clamping mechanism.

[0003] Existing clamping mechanisms typically lock the mold from the outside. Therefore, the space required for the injection mold on the injection molding machine includes not only the mold's own space but also the space needed to install the clamping mechanism. This forces an increase in the lateral dimension of the mold on the injection molding machine, hindering equipment miniaturization. Furthermore, when using existing clamping mechanisms to lock the mold, manual adjustment of the clamping force is usually required. Therefore, when adjusting different internal clamping blocks on the clamping mechanism, positional errors may exist between the different internal clamping blocks, leading to errors in the mold's positioning and affecting the clamping mechanism's positioning effectiveness.

[0004] To address this, an internal clamping fixture for injection molds is proposed. Summary of the Invention

[0005] The purpose of this invention is to provide an internal clamping fixture for injection molds, which reduces the lateral space occupied by the clamping fixture on the injection molding machine mold, and at the same time improves the synchronicity of the movement of each internal clamping block of the clamping fixture, thereby improving the positioning and clamping effect of the fixture on the mold.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] An internal clamping fixture for injection molds includes a lower mold base and an upper mold base. The lower mold base has a drive cavity, in which an electric push rod is fixedly installed. Multiple transmission rods are arranged within the drive cavity, each connected to the electric push rod. A lateral groove is formed on the lower mold base, communicating with the drive cavity. An internal clamping block is movably disposed within the lateral groove. A guide post is fixedly installed on the internal clamping block. An inclined guide groove is formed on the transmission rod, and the guide post is movably disposed within the inclined guide groove. A clearance groove is formed on the upper mold base to accommodate the transmission rod. A positioning block is fixedly installed on the upper mold base to abut against the internal clamping block.

[0008] Based on this solution, when clamping the injection mold, the upper mold base needs to be fixedly installed on the bottom of the injection mold first. Then, the injection mold can be moved above the lower mold base using a hoisting device. The hoisting device is then used to lower the injection mold with the upper mold base onto the top surface of the lower mold base, so that the transmission rod enters the clearance groove. At the same time, the lower mold base bears the weight of the mold. Then, the mold is separated from the hoisting device.

[0009] The electric push rod is then activated, causing it to retract downwards. This retraction moves the various transmission rods downwards accordingly, causing the sides of the inclined guide groove to press against the guide post. This, in turn, moves the guide post and the inner clamping block horizontally towards the center of the mold base, bringing them closer to the positioning block. Ultimately, the inner clamping block is pressed tightly against the positioning block, restricting the movement of the upper mold base and the mold. Simultaneously, multiple inner clamping blocks abut against different sides of the positioning block, clamping it and thus positioning and clamping the mold.

[0010] Accordingly, when the mold is removed from the injection molding machine, the electric push rod is activated and moves upward. This causes the inclined guide groove on the transmission rod to press against the guide post, causing the inner clamping block to move away from the positioning block. Ultimately, the inner clamping block no longer restricts the movement of the positioning block. Thus, the mold can be removed from the injection molding machine.

[0011] Unlike traditional mold clamping fixtures, this invention clamps the mold from its bottom surface, and after clamping, the fixture can be stored in the space below the bottom of the mold. Therefore, this invention does not require additional lateral space on the injection molding machine after clamping, thus facilitating the miniaturization of the injection molding machine structure. Furthermore, the electric push rod simultaneously drives multiple transmission rods, improving the synchronization of their movements. This ensures the synchronized movement of each inner clamping block, reducing positional errors and improving the fixture's positioning effect on the mold.

[0012] Preferably, the inclined guide groove is provided with a straight section, which is located at the lower end of the inclined guide groove and is arranged along the axial direction of the transmission rod.

[0013] With this configuration, when the guide post moves within the vertical section, it will not cause horizontal movement of the guide post and the inner clamping block. Therefore, when the drive rod pushes upwards, causing the inner clamping block to no longer restrict the movement of the positioning block, the drive rod can continue to push upwards without causing horizontal displacement of the inner clamping block. This allows the drive rod to extend upwards beyond the top surface of the lower mold base.

[0014] Therefore, during the process of lowering the injection mold to the lower mold base using a hoisting device, the hoisting device first lowers the injection mold equipped with the upper mold base onto the transmission rod. At this time, the transmission rod abuts against the relief groove and temporarily supports the weight of the mold. Then, the mold can be separated from the hoisting device. Subsequently, the electric push rod is activated, causing it to retract downwards. Each transmission rod also moves downwards accordingly, so that the bottom surface of the upper mold base finally contacts the top surface of the lower mold base. At this point, the lower mold base supports the mold, and the positioning block extends into the drive cavity. During this process, the transmission rod moves within the vertical section without causing horizontal movement of the inner clamping block.

[0015] Subsequently, the electric push rod continues to drive the transmission rod downwards. At this point, the guide post enters the inclined guide groove, and the side of the inclined guide groove presses against the guide post. This causes the guide post and the inner clamping block to move horizontally closer to the positioning block, ultimately causing the inner clamping block to press tightly against the positioning block to restrict the movement of the upper mold base and the mold. Multiple inner clamping blocks simultaneously abut against different sides of the positioning block, thus clamping the positioning block and positioning and clamping the mold.

[0016] This design allows the mold to be temporarily supported by a transmission rod when it is hoisted and placed onto the present invention, ensuring a certain gap between the upper and lower mold bases when the mold is securely placed. This facilitates the disassembly of the connecting components between the hoisting equipment and the mold, such as the straps passing through the bottom of the upper mold base, thereby simplifying the operation of the present invention and reducing the difficulty and complexity of mold installation.

[0017] Accordingly, when the mold is removed from the injection molding machine, the electric push rod is activated and moves upward. This causes the inclined guide groove on the transmission rod to press against the guide post, moving the inner clamping block away from the positioning block until it no longer restricts the movement of the positioning block. The electric push rod then continues to push the transmission rod upward, causing its top end to abut against the upper mold base, further pushing the upper mold base and mold upward to create a gap between them. This gap allows the operator to easily pass through and secure the mold with straps, facilitating the lifting equipment to remove the mold from the injection molding machine.

[0018] Preferably, a locking part is provided on the inclined guide groove. The locking part is located at the upper end of the inclined guide groove and is arranged along the axial direction of the transmission rod. The upper end of the locking part is not connected to the outside of the top end of the transmission rod.

[0019] With this configuration, as the electric actuator moves the transmission rod downwards, once the guide post reaches the upper end of the inclined guide groove, the electric actuator will continue to move the transmission rod downwards, causing the guide post to enter the locking part. At this time, since the locking part is arranged along the axial direction of the transmission rod, the movement of the guide post within the locking part will not cause the inner locking block to move horizontally.

[0020] When the guide post enters the locking part, the squeezing force of the guide post on the locking part and the transmission rod will be concentrated in the horizontal direction. Since the transmission rod is restricted by the drive cavity and cannot move in any direction other than vertically, the position of the guide post is also restricted and cannot move. Correspondingly, the inner clamping block cannot move either, so that the inner clamping block can be stably held in the current clamping position, ensuring the clamping effect of the inner clamping block on the upper mold base and the mold.

[0021] Preferably, a positioning post is fixedly installed at the top of all the transmission rods, and a positioning hole is opened in all the relief grooves; the multiple positioning posts correspond one-to-one with the multiple positioning holes, and the positioning holes are used to accommodate the positioning posts.

[0022] This design allows for easier alignment of the upper and lower mold bases when the mold is hoisted and placed onto the present invention, thanks to the cooperation of the positioning pins and positioning holes. This ensures accurate mold installation. Simultaneously, the cooperation of the positioning pins and positioning holes also provides horizontal limitation for the mold when it is temporarily supported by the transmission rod. Therefore, even if the mold is bumped during the removal of the hoisting straps, the mold's positional accuracy will not be affected, thus helping to ensure the mold's installation precision and improving the reliability of the invention.

[0023] Preferably, an electric push rod is installed inside the drive cavity, and a base plate is fixedly installed on the top end of the electric push rod. The electric push rod is connected to the center of the base plate, and multiple support columns are fixedly installed on the base plate. A second base plate is provided at the top end of the multiple support columns, and multiple transmission rods are fixedly installed on the top end of the second base plate. The multiple support columns are located below the multiple transmission rods, and the multiple support columns correspond one-to-one with the multiple transmission rods.

[0024] With this setup, multiple transmission rods can be driven simultaneously by using only a single electric push rod to push the center of the base plate. This helps to avoid transmission rod displacement errors caused by the stroke errors of multiple electric push rods, ensuring that the displacement of each transmission rod is the same. This, in turn, helps to improve the degree of displacement synchronization of all inner clamping blocks, reduce the positional error of the inner clamping blocks, and improve the positioning effect of the fixture on the mold.

[0025] However, when a single electric actuator pushes the center of the base plate, the base plate will bend due to the reaction force exerted by the transmission rod. If the transmission rod is directly fixed to the base plate at this time, the bending of the base plate will cause the transmission rod to tilt, resulting in additional friction and resistance between the transmission rod and the side wall of the drive cavity, which will negatively affect the smoothness of the movement during the service life of the present invention.

[0026] Therefore, a second base plate and support columns are provided. With this arrangement, the electric push rod pushes the second base plate via the first base plate, thereby indirectly moving the transmission rod. Furthermore, the first base plate pushes the second base plate via the support columns; that is, the point of application of the thrust from the first base plate to the second base plate is the contact point between the support columns and the second base plate. Since each support column is located below its respective transmission rod, the force exerted by the support columns on the second base plate can directly act on the transmission rod in the vertical direction. In other words, the bending moment between the force from the transmission rod and the force from the support columns on the second base plate at the same transmission rod position is zero, thus preventing the second base plate from bending. Therefore, tilting of the transmission rod can be avoided, which helps prevent additional friction and resistance between the transmission rod and the side walls of the drive cavity and the clearance groove, thereby extending the service life of the invention and improving its smoothness of movement.

[0027] It is worth noting that when the support column tilts due to the bending of the base plate, since the support column is a two-force member, the tilted support column will exert a horizontal component of the force on the base plate. If this component force acts on the transmission rod, it will still cause the transmission rod to tilt. However, by specifically designing the base plate, the horizontal component forces exerted on the base plate by the multiple support columns can be balanced, thereby preventing the transmission rod from tilting. At the same time, the structural strength of the base plate can also be used to offset the effect of this component force on the transmission rod.

[0028] Based on this, ball heads can be fixedly installed on the top of each support column, and multiple spherical grooves for accommodating the ball heads can be opened at the bottom of the second base plate, with each spherical groove corresponding to each support column.

[0029] With this design, when the base plate bends and causes the support column to tilt, the ball joint is restrained by the spherical groove due to the fit between the ball head and the groove. Therefore, the support column will not disengage from the groove but will instead rotate around the center of the ball head. Consequently, the support point and force application point of the support column on the base plate will not change. This helps ensure that the bending moment between the force from the transmission rod and the force from the support column at the same transmission rod position on the base plate is zero, thus preventing the base plate from bending and avoiding tilting of the transmission rod. This extends the service life of the invention and improves its operational stability.

[0030] Preferably, a plurality of air guide grooves are provided on the side wall of the driving cavity, and the opening of the air guide grooves always abuts against the side of the first base plate and the second base plate.

[0031] With this configuration, the multiple chambers separated by the first and second base plates can be connected within the drive cavity via the air guide groove. This allows the gas between the separated chambers to circulate when the first and second base plates move within the drive cavity, thereby avoiding additional resistance caused by pressure differences. This helps ensure the smooth movement of the transmission rod and improves the motion stability of the invention.

[0032] Preferably, the air guide groove is arranged at an angle, and a guide part is provided at the lower end of the air guide groove, and an inclined part is provided on the lower end wall of the guide part.

[0033] With this configuration, when base plate one and base plate two move within the drive cavity, due to the inclined arrangement of the air guide grooves, the contact points between the openings of the air guide grooves and base plate one and base plate two will change along their edges, thereby allowing the openings of the air guide grooves to scrape the edges of base plate one and base plate two. Therefore, during long-term use, debris generated on the edges of base plate one and base plate two due to rust, wear, etc., can be promptly scraped away by the edges of the air guide grooves. This prevents the debris from accumulating in the gaps between base plate one and base plate two and the drive cavity, and consequently, it does not create resistance to the movement of base plate one and base plate two, thus improving the stability of the movement. Simultaneously, by providing the guide portion and the inclined surface, the debris scraped away by the air guide grooves will first fall along the inside of the air guide grooves into the guide portion, and finally fall along the inclined surface to the bottom of the drive cavity, thus moving away from base plate one and base plate two.

[0034] It is worth noting that when base plate one and base plate two move within the drive chamber, the gas flow between the various chambers needs to pass through the air guide grooves, thus creating airflow within the air guide grooves. This airflow can blow and loosen the debris scraped off from the edges of the air guide grooves, thereby facilitating the downward fall of these debris.

[0035] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0036] 1. This invention can clamp the mold from the bottom, and after the clamping operation is completed, the clamping fixture can be stored in the space below the bottom of the mold. Therefore, this invention does not require additional lateral space on the injection molding machine after the clamping operation is completed, which is conducive to the miniaturization of the injection molding machine structure. Furthermore, the electric push rod simultaneously drives multiple transmission rods, which helps to improve the synchronization of the movement of multiple transmission rods, thereby ensuring the synchronization of the movement of each inner clamping block, reducing the positional error of the inner clamping block, and improving the positioning effect of the fixture on the mold.

[0037] 2. By setting a straight section, after the transmission rod pushes upward and the inner clamping block no longer restricts the movement of the positioning block, the transmission rod can continue to push upward without causing the inner clamping block to shift horizontally. This allows the transmission rod to extend upward beyond the top surface of the lower mold base. Therefore, when the mold is hoisted and placed onto this invention, the mold can be temporarily supported by the transmission rod, ensuring a certain gap between the upper and lower mold bases when the mold is stably placed. This facilitates the disassembly of the connecting components between the hoisting equipment and the mold, thus simplifying the operation of this invention and reducing the difficulty and complexity of mold installation.

[0038] 3. By setting up a base plate one, a support column, and a base plate two, this invention can simultaneously drive multiple transmission rods while using only a single electric push rod to push the center of base plate one. This helps avoid transmission rod displacement errors caused by stroke errors of multiple electric push rods, ensuring that the displacement of each transmission rod is the same. This, in turn, improves the synchronization of displacement of all inner clamping blocks, reduces positional errors of the inner clamping blocks, and improves the positioning effect of the fixture on the mold. Simultaneously, it prevents the transmission rods from tilting, which helps reduce motion friction and resistance, thereby extending the service life of this invention and improving its motion smoothness. Attached Figure Description

[0039] Figure 1 This is a plan view illustrating the overall structural fit of the present invention;

[0040] Figure 2 A schematic diagram showing the fit between the fixed base and its upper structure after the top cover is removed from the lower mold base;

[0041] Figure 3 for Figure 2 Schematic diagram of the cross-section structure under the SS plane;

[0042] Figure 4 for Figure 3 A schematic diagram showing the state of the structure when it is engaged with the upper mold base and positioning block;

[0043] Figure 5 for Figure 3 A magnified view of part A in the middle;

[0044] Figure 6 for Figure 3 A magnified view of part B in the middle section;

[0045] Figure 7 This is a schematic diagram showing the fit between the side groove and the clearance groove;

[0046] Figure 8 This is a schematic diagram showing the fit between the transmission rod and the inner clamping block;

[0047] Figure 9This is a schematic diagram showing the arrangement of the guide section and the inclined section.

[0048] In the diagram: 1. Lower mold base; 2. Upper mold base; 3. Positioning block; 4. Top cover; 11. Drive cavity; 12. Transmission rod; 13. Side groove; 14. Inner clamping block; 15. Electric push rod; 16. Base plate one; 17. Base plate two; 21. Positioning hole; 22. Positioning post; 41. Fixed seat; 111. Air guide groove; 112. Guide part; 113. Angled part; 121. Angled guide groove; 122. Straight part; 123. Locking part; 124. Guide post; 131. Relief groove; 161. Support post; 162. Ball head; 163. Spherical groove. Detailed Implementation

[0049] The following description, with the aid of the accompanying drawings listed in the foregoing "Description of Drawings", will clearly illustrate the specific embodiments of the present invention, in order to enable readers to have a more complete and objective understanding of the working principle and corresponding technical effects of the present invention.

[0050] like Figures 1 to 9 The figure illustrates a specific embodiment of the present invention. It should be noted that: firstly, to improve readability, the two-dimensional figures in the figures are simplified; therefore, only the parts involved in the present invention are shown, while irrelevant complex structures and shapes are omitted; secondly, the lower mold base 1 includes a fixed base 41 and a top cover 4. Structures and components such as the driving cavity 11 are disposed on the fixed base 41, while the top cover 4 covers the top of the fixed base 41, serving as a stable support platform for the upper mold base 2 and the mold, while also protecting the components within the fixed base 41; thirdly, Figure 4 The top cover 4 is omitted to avoid reducing the readability of the drawing due to the section line of the top cover 4. In practical applications, the top cover 4 should be installed on the fixed cover to form a flat plane so that the lower mold base 1 can bear the weight of the mold.

[0051] When installing this invention, first remove the lower mold base 1 and the upper mold base 2; a drive cavity 11 is provided in the lower mold base 1, an electric push rod 15 is fixedly installed in the drive cavity 11, and multiple transmission rods 12 are provided in the drive cavity 11, all of which are connected to the electric push rod 15; a lateral groove 13 is provided on the lower mold base 1, which communicates with the drive cavity 11, and an inner clamping block 14 is movably arranged in the lateral groove 13; a guide post 124 is fixedly installed on the inner clamping block 14, and an inclined guide groove 121 is provided on the transmission rod 12, which is arranged at an angle, and the guide post 124 is movably arranged in the inclined guide groove 121; a relief groove 131 for accommodating the transmission rod 12 is provided on the upper mold base 2, and a positioning block 3 for abutting and cooperating with the inner clamping block 14 is fixedly installed on the upper mold base 2.

[0052] The inclined guide groove 121 is provided with a straight section 122, which is located at the lower end of the inclined guide groove 121 and is arranged along the axial direction of the transmission rod 12. A locking section 123 is provided on the inclined guide groove 121, located at the upper end of the inclined guide groove 121 and arranged along the axial direction of the transmission rod 12. The upper end of the locking section 123 is not connected to the external top of the transmission rod 12. A positioning post 22 is fixedly installed at the top of each transmission rod 12, and a positioning hole 21 is provided in each of the clearance grooves 131. Multiple positioning posts 22 correspond one-to-one with multiple positioning holes 21, and the positioning holes 21 are used to accommodate the positioning posts 22.

[0053] In addition, only one electric push rod 15 is installed in the drive cavity 11. A base plate 16 is fixedly installed on the top of the electric push rod 15, and the electric push rod 15 is connected to the center of the base plate 16. Multiple support columns 161 are fixedly installed on the base plate 16. A base plate 2 17 is provided on the top of the multiple support columns 161. Multiple transmission rods 12 are fixedly installed on the top of the base plate 2 17. The multiple support columns 161 are located below the multiple transmission rods 12, and the multiple support columns 161 correspond one-to-one with the multiple transmission rods 12. Multiple air guide grooves 111 are opened on the side wall of the drive cavity 11. The opening of the air guide grooves 111 always abuts against the side of the base plate 16 and the base plate 2 17. A ball head 162 is fixedly installed on the top of all support columns 161. Multiple spherical grooves 163 for accommodating the ball head 162 are opened at the bottom of the base plate 2 17. The multiple spherical grooves 163 correspond one-to-one with the multiple support columns 161. The air guide groove 111 is arranged at an angle, and a guide part 112 is provided at the lower end of the air guide groove 111. An inclined part 113 is provided on the lower end wall of the guide part 112.

[0054] When this invention is in operation, the upper mold base 2 needs to be fixedly installed on the bottom of the injection mold. Then, the injection mold can be moved above the lower mold base 1 by the hoisting equipment, and then the hoisting equipment is operated to lower the injection mold equipped with the upper mold base 2 to the top surface of the lower mold base 1, so that the transmission rod 12 enters the relief groove 131. At the same time, the lower mold base 1 bears the weight of the mold, and then the mold is separated from the hoisting equipment.

[0055] Subsequently, the electric push rod 15 is activated, causing it to retract downwards. Each transmission rod 12 also moves downwards accordingly. This causes the side of the inclined guide groove 121 to press against the guide post 124, resulting in the guide post 124 and the inner clamping block 14 moving horizontally towards the center of the mold base 1 and approaching the positioning block 3. Ultimately, the inner clamping block 14 presses tightly against the positioning block 3, restricting the movement of the upper mold base 2 and the mold. Simultaneously, multiple inner clamping blocks 14 abut against different sides of the positioning block 3, clamping the positioning block 3 and thus positioning and clamping the mold.

[0056] Accordingly, when the mold is removed from the injection molding machine, the electric push rod 15 is activated and moves upward. This causes the inclined guide groove 121 on the transmission rod 12 to press against the guide post 124, causing the inner clamping block 14 to move away from the positioning block 3. Ultimately, the inner clamping block 14 no longer restricts the movement of the positioning block 3. Thus, the mold can be removed from the injection molding machine.

[0057] Unlike traditional mold clamping fixtures, this invention clamps the mold from its bottom surface, and after clamping, the fixture can be stored in the space below the bottom of the mold. Therefore, this invention does not require additional lateral space on the injection molding machine after clamping, thus facilitating the miniaturization of the injection molding machine structure. Furthermore, the electric push rod 15 simultaneously drives multiple transmission rods 12, improving the synchronization of their movements. This ensures the synchronization of the movements of each inner clamping block 14, reducing positional errors and improving the positioning effect of the fixture on the mold.

[0058] By providing a straight section 122, when the guide post 124 moves within the straight section 122, it will not cause horizontal movement of the guide post 124 and the inner clamping block 14. Therefore, when the transmission rod 12 pushes upwards, causing the inner clamping block 14 to no longer restrict the movement of the positioning block 3, the transmission rod 12 can continue to push upwards without causing horizontal displacement of the inner clamping block 14. This allows the transmission rod 12 to extend upwards beyond the top surface of the lower mold base 1.

[0059] Therefore, during the process of lowering the injection mold to the lower mold base 1 using the hoisting equipment, the hoisting equipment first lowers the injection mold equipped with the upper mold base 2 onto the transmission rod 12. At this time, the transmission rod 12 abuts against the relief groove 131 and temporarily supports the weight of the mold. Then, the mold can be separated from the hoisting equipment. Subsequently, the electric push rod 15 is activated, causing it to retract downwards. Each transmission rod 12 will also move downwards accordingly, so that the bottom surface of the upper mold base 2 finally contacts the top surface of the lower mold base 1. At this time, the lower mold base 1 then supports the mold, and the positioning block 3 extends into the drive cavity 11. During this process, the transmission rod 12 moves within the straight portion 122 without causing the inner clamping block 14 to move horizontally.

[0060] Subsequently, the electric push rod 15 continues to drive the transmission rod 12 downwards. At this time, the guide post 124 enters the inclined guide groove 121. The side of the inclined guide groove 121 then presses against the guide post 124, causing the guide post 124 and the inner clamping block 14 to move horizontally and approach the positioning block 3. Ultimately, the inner clamping block 14 is pressed tightly against the positioning block 3 to restrict the movement of the upper mold base 2 and the mold. Multiple inner clamping blocks 14 simultaneously abut against different sides of the positioning block 3, thereby clamping the positioning block 3 and positioning and clamping the mold.

[0061] This design allows the mold to be temporarily supported by the transmission rod 12 when it is hoisted and placed onto the present invention. This ensures that a certain gap exists between the upper mold base 2 and the lower mold base 1 when the mold is placed securely. This facilitates the disassembly of the connecting components between the hoisting equipment and the mold, such as the straps passing through the bottom of the upper mold base 2, thereby simplifying the operation of the present invention and reducing the difficulty and complexity of mold installation.

[0062] It is worth noting that, under the condition that only a single electric push rod 15 pushes the center of the base plate 16, the present invention can simultaneously push multiple transmission rods 12, thereby helping to avoid the displacement error of the transmission rods 12 caused by the stroke error of multiple electric push rods 15, ensuring that the displacement of each transmission rod 12 is the same, which in turn helps to improve the degree of displacement synchronization of all inner clamping blocks 14, reduce the position error of the inner clamping blocks 14, and improve the positioning effect of the fixture on the mold.

[0063] However, when a single electric actuator 15 pushes the center of the base plate 16, the base plate 16 will bend due to the reaction force exerted by the transmission rod 12 on it. If the transmission rod 12 is directly fixed to the base plate 16 at this time, the bending of the base plate 16 will cause the transmission rod 12 to tilt, resulting in additional friction and resistance between the transmission rod 12 and the side wall of the drive cavity 11, which will negatively affect the smoothness of the movement during the service life of the present invention.

[0064] Therefore, a base plate 17 and support columns 161 are provided. With this arrangement, the electric push rod 15 pushes the base plate 17 via the base plate 16, thereby indirectly moving the transmission rod 12. Furthermore, the base plate 16 pushes the base plate 17 via the support columns 161; that is, the point of application of the thrust from the base plate 16 to the base plate 17 is the contact point between the support columns 161 and the base plate 17. Since each support column 161 is located below each transmission rod 12, the force exerted by the support columns 161 on the base plate 17 can act directly on the transmission rod 12 in the vertical direction. That is, the bending moment between the force from the transmission rod 12 and the force from the support columns 161 on the base plate 17 at the same position is zero, thus preventing the base plate 17 from bending. Therefore, the transmission rod 12 can be prevented from tilting, which helps to prevent additional friction and resistance between the transmission rod 12 and the side wall of the drive cavity 11, thereby extending the service life of the invention and improving the smoothness of the movement of the invention.

[0065] It should be emphasized that, based on the content described above, although the beneficial effects of the present invention have been explained in detail and corresponding specific embodiments have been provided, those skilled in the art can still achieve the same technical effects by making conventional substitutions, modifications, or other alterations to the given technical solutions without creative effort, provided they fully understand the working principle of the present invention. However, such modifications should not be considered as exceeding the scope of the present invention. Specifically, the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An internal clamping fixture for injection molds, characterized in that, The utility model provides a kind of injection moulding machine, including lower die holder (1) and upper die holder (2);Driving cavity (11) is opened in the lower die holder (1), electric push rod (15) is fixedly installed in the driving cavity (11), a plurality of transmission rods (12) are provided in the driving cavity (11), and a plurality of the transmission rods (12) are connected with electric push rod (15);Side slot (13) is opened on the lower die holder (1), the side slot (13) is communicated with driving cavity (11), and inner buckle clamp block (14) is movably arranged in the side slot (13);Guide column (124) is fixedly installed on the inner buckle clamp block (14), oblique guide slot (121) is opened on the transmission rod (12), the oblique guide slot (121) is obliquely arranged, and the guide column (124) is movably arranged in oblique guide slot (121);The upper die holder (2) is opened with the slot (131) for accommodating transmission rod (12), and the upper die holder (2) is fixedly installed with the positioning block (3) for being matched with inner buckle clamp block (14);The upper die holder (2) is combined with the lower die holder (1) to be used for installing injection mould, when the lower die holder (1) is combined with the upper die holder (2), and electric push rod (15) drives the transmission rod (12) to move, a plurality of the inner buckle clamp block (14) is extended and matched with the positioning block (3) to limit the movement of injection mould, one electric push rod (15) is installed in the driving cavity (11), the top of electric push rod (15) is fixedly installed with bottom plate one (16), the center position of electric push rod (15) and bottom plate one (16) is connected, and a plurality of support columns (161) are fixedly installed on bottom plate one (16);The top of a plurality of the support columns (161) is commonly provided with bottom plate two (17), and a plurality of the transmission rods (12) are fixedly installed at the top of bottom plate two (17);A plurality of the support columns (161) are respectively below a plurality of transmission rods (12), and a plurality of support columns (161) are one-to-one corresponding with a plurality of transmission rods (12); A plurality of air guide grooves (111) are opened on the side wall surface of the driving cavity (11), and the opening of the air guide groove (111) is always matched with the side surface of bottom plate one (16) and bottom plate two (17); The top of all the support columns (161) is fixedly installed with ball head (162), and a plurality of spherical grooves (163) for accommodating ball head (162) are opened at the bottom end of bottom plate two (17);A plurality of the spherical grooves (163) are one-to-one corresponding with a plurality of support columns (161) respectively; The air guide groove (111) is obliquely arranged, and the air guide groove (111) is provided with guide part (112) at lower end, and the lower end wall surface of guide part (112) is provided with inclined surface part (113).

2. An inner knockout clamp tool for injection molds according to claim 1, characterized in that, Straight part (122) is arranged on the oblique guide slot (121), and the straight part (122) is arranged at the lower end of oblique guide slot (121), and the straight part (122) is arranged along the axis direction of transmission rod (12).

3. An inner knockout clamp tool for injection molds as defined in claim 1, wherein The oblique guide groove (121) is provided with a locking part (123), the locking part (123) is arranged at the upper end of the oblique guide groove (121), the locking part (123) is arranged along the axis direction of the transmission rod (12), and the upper end of the locking part (123) is not communicated with the outside of the top end of the transmission rod (12).

4. An inner knockout clamp tool for injection molds as defined in claim 1, wherein The top end of all the transmission rods (12) is fixedly provided with a positioning column (22), and all the giving-way grooves (131) are provided with a positioning hole (21); a plurality of the positioning columns (22) and a plurality of the positioning holes (21) are one-to-one corresponding, and the positioning hole (21) is used for accommodating the positioning column (22).

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